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United States Patent | 5,020,261 |
Lishman | June 4, 1991 |
A moisture sensitive self-watering planter utilizes a control valve to effect watering of the soil in a liner of the planter upon automatic detection of a predetermined level of dryness of the soil. The planter uses a weight-based system of detecting the amount of moisture in the soil to control the automatic release of a predetermined amount of water into the soil for rehydration thereof. As the weight of the soil increases with the volume of water, the valve is automatically closed to terminate the irrigation process.
Inventors: | Lishman; Fred W. (7770 Marshall Heights Ct., Falls Church, VA 22043) |
Appl. No.: | 284897 |
Filed: | December 15, 1988 |
Current U.S. Class: | 47/79; 47/39 |
Intern'l Class: | A01G 027/00 |
Field of Search: | 47/62,63,79,80,81,67,39,48.5 |
1231976 | Jul., 1917 | Weitzel | 47/79. |
1555675 | Sep., 1925 | Kruszynski | 47/79. |
3168797 | Feb., 1965 | Patassy | 47/79. |
3293799 | Dec., 1966 | Keller | 47/79. |
3906667 | Sep., 1975 | Williams | 47/79. |
4060934 | Dec., 1977 | Skaggs | 47/79. |
4092802 | Jun., 1978 | Oyama | 47/16. |
4557071 | Dec., 1985 | Fah | 47/48. |
4760666 | Aug., 1988 | Han | 47/79. |
Foreign Patent Documents | |||
2632347 | Jan., 1978 | DE | 47/79. |
841340 | May., 1939 | FR | 47/79. |